Mr. Ed Sibley:

There is a very long answer to that question taking in how banking supervision works now. The ECB is responsible overall for the supervision of the banking system within the eurozone. It is directly responsible for the prudential supervision of what are called the "significant" banks, or the biggest banks operating in a particular country. The heads of teams that supervise banks, again from a prudential perspective, are employed by the ECB and the teams are staffed by both ECB staff and, in the case of Ireland, Central Bank staff.